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LIZard137
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Homework Statement
In the figure below the charge in the middle is Q = -4.6nC. For what charge q1 will charge q2 be in static equilibrium?
q1-----10cm------Q------10cm------q2
I know that the answer is supposed to be 18nC.
Homework Equations
F=Ke lq1llq2l/r2
The Attempt at a Solution
Since the charges are in static equilibrium, I'd assume that F=0. So...
0=(kel-4.6llq1l/102)+(kelq1lq2l/202)
I've tried several ways of working this problem with Coulomb's Law, but I just can't seem to find the initial step in the right direction.